board_common:Add BOARD_INDICATE_ARMED_STATE
board_common:Add BOARD_INDICATE_ARMED_STATE

   This adds an optional default support for HW that does not
   have and external armed indiction.

dagar/Firmware,dagar/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,PX4/Firmware,PX4/Firmware,PX4/Firmware,acfloria/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,krbeverx/Firmware,dagar/Firmware,PX4/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,dagar/Firmware,acfloria/Firmware,dagar/Firmware,PX4/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,acfloria/Firmware,krbeverx/Firmware,krbeverx/Firmware,acfloria/Firmware,PX4/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,krbeverx/Firmware,acfloria/Firmware,PX4/Firmware